Product category:
Optical Transceivers, Transponders and Repeaters
News Release from: Siemens ICN
Edited by the Electronicstalk Editorial
Team on 25 September 2003
Electrical solution for polarisation
state control
This week at ECOC in Rimini, Italy, Siemens ICN will report on polarisation demultiplexing after optical-to-electrical conversion using an analogue-IC-based polarisation state controller.
This week at ECOC in Rimini, Italy, Siemens ICN will report on polarisation demultiplexing after optical-to-electrical conversion using an analogue integrated-circuit based polarisation state controller This device can be used for endless unwinding polarisation state control and demultiplexing of polarisation multiplexed optical signals resulting in cheaper and faster transmission
This article was originally published on Electronicstalk on 8 Nov 2004 at 8.00am (UK)
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Polarisation multiplexing allows for a doubling of the spectral efficiency of most modulation formats, because it employs the two available orthogonal polarisation states at the same wavelength as independent communication channels.
This multiplexing technique is often used to obtain the highest transmission capacities in hero experiments.
During propagation of the two polarisation signals through the optical transmission fibre, the polarisation state changes due to the fibre birefringence.
Hence at the end-of-line in order to optimally demultiplex the two polarisation channels, a polarisation state controller is required.
State of the art systems use an optical polarisation state controller for the inverse Jones matrix operation because of its simplicity and because electro-optic devices exist allowing for fast automatic control.
However it is known from radio communication that polarisation demultiplexing can be performed at the detector using a phase diversity coherent receiver.
The polarisation demultiplexer presented at ECOC is based on a similar technology with an electrical analogue-IC-based polarisation state controller for ultrafast polarisation control.
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